Loans and Loans Held for Sale - Summary of Nonperforming Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Net Nonperforming Assets, Assumed in Business Acquisitions	$ 16,300
Nonperforming Assets
Nonaccrual loans	27,723	$ 7,021
Nonaccrual TDRs	7,659	5,436
Total nonaccrual loans	35,382	12,457
OREO	354	166
Total Nonperforming Assets	35,736	12,623
Commercial and Industrial
Nonperforming Assets
Total nonaccrual loans	9,279	$ 1,622
Total Nonperforming Assets	$ 4,700